Abstract:
An apparatus (1) for heating parisons (2) of thermoplastic material comprises: a conveyor (3) defining a path along which the parisons (2) are fed; a plurality of supporting elements (6) having a structure (7) fixed to the conveyor (3) and a rod (8) rotatably associated with the structure (7) to rotate about a longitudinal axis and mobile axially relative to the structure (7) between a lowered position, where a lower end of the rod (8) is operatively inserted in a parison (2) in such a way as to retain it and drive it rotationally about its longitudinal axis, and a raised position, where the parison (2) is disengaged from the rod (8); a linking element (11) kinematically coupled to rotary means (12) rotatably associated with the structures (7) and coupled to the rods (8) in such a way that the rods (8) are made to rotate about their longitudinal axes while they move as one with the conveyor (3); heating means (10) designed to heat the parisons (2) as the latter move along at least a part of their feed path. The supporting element (6) comprises a friction clutch (13) connected to the rod (8) and to the rotary member (12) to define a first operating position, where the rod (8) is engaged with the rotary member (12), and a second operating position, where the rod (8) is disengaged from the rotary member (12).
Abstract:
A moulding unit for a plant for blow-moulding plastic containers (2) from respective parisons (3) comprises: two half-moulds (17a, 17b), movable relative to each other between a position of opening and a position of closing at least one cavity (19) for blow-moulding a respective container (2); and a locking device (21) for locking the two half -moulds (17a, 17b) in the closed position, the locking device (21) comprising two first fastening elements (22, 28) which are moved to, and normally held in, a locked position by at least one elastic actuating element (30).
Abstract:
A plant for blow-moulding plastic containers (2) from respective parisons (3) is equipped with a plurality of interchangeable moulding units (15), each having a predetermined number of moulding cavities (19) for blow-moulding respective containers (2); with a wheel (39) for feeding the parisons (3) to the respective moulding cavities (19); with a wheel (76) for picking up the containers (2) from the respective moulding cavities (19); and with two lines (41, 79) for feeding the parisons (3) to the first transfer wheel (39); and the containers (2) from the pick-up wheel (76) to a filling machine (10), respectively; the feed speeds of the two feed lines (41, 79) vary according to the number of moulding cavities (19) in the moulding units (15) mounted on the plant at a given time.
Abstract:
A dispensing device for dispensing plastics in a pasty state comprises channel means (7) along which said plastics passe, switching means (2) movable between a first operating position (W) in which said switching means (2) connects said channel means (7) to conduit means (68) and a second operating position in which said switching means (2) connects said channel means (7) to further conduit means and driving means (5; 105) for moving said switching means (2) between said first operating position (W) and said second operating position, said driving means (5; 105) comprising an actuator (70; 88) and a further actuator (71; 89) .
Abstract:
The invention comprises a rotating transfer machine (40), arranged outside the path of the die cavities, having a plurality of transfer chambers (50) carried in continuous rotation, each adapted for containing a polymeric body (D) and for transferring it to a die cavity (21), and having moving means adapted for moving in a succession the transfer chambers (50) along a same path (P2) so that this path (P2) has a portion (T1) concomitant with the path (P3) of the dies, during which each transfer chamber (50) is in coaxial position and above a die cavity (21) and its motion coincides with the motion of the latter, said transfer of the polymeric body (D) to the die cavity (21) being carried out in this portion (T1). A relatively long path and thereby a correspondingly long time are provided for transferring polymeric bodies from the transfer chambers (50) to the die cavities, for carrying out and effective and correct transfer of the polymeric bodies into the die cavities, starting from a dispensing outlet of the extruder of the polymeric material, also in the case that such body has a relatively large mass.
Abstract:
An apparatus (1) for heating parisons (2) of thermoplastic material comprises: a conveyor (3) defining a path along which the parisons (2) are fed; a plurality of supporting elements (6) having a structure (7) fixed to the conveyor (3) and a rod (8) rotatably associated with the structure (7) to rotate about a longitudinal axis and having a lower end that can be operatively inserted in a parison (2) in such a way as to retain it and drive it rotationally about its longitudinal axis; a linking element (11) kinematically coupled to rotary means (12) rotatably associated with the structures (7) and coupled to the rods (8) in such a way that the rods (8) are made to rotate about their longitudinal axes while they move as one with the conveyor (3); heating means (10) designed to heat the parisons (2) as the latter move along at least a part of their feed path. The linking element (11) is motor driven to enable it to control the speed at which the parisons (2) rotate about their longitudinal axes.
Abstract:
A moulding unit for a plant for blow-moulding plastic containers (2), particularly bottles, from respective parisons (3) is equipped with an interchangeable mould (16) having at least one cavity (19) for blow-moulding a respective container (2), and at least two stretching rods (33) mobile along a predetermined line (24) to engage respective parisons (3) and to axially deform the parisons (3) themselves; the stretching rods (33) being selectively mobile according to the number and/or position of the moulding cavities (19) of the mould (16) mounted on the moulding unit at a given time.
Abstract:
A plant for blow-moulding plastic containers (2), particularly bottles, from respective parisons (3) is equipped with a plurality of moulding units (15), each having at least two respective cavities (19) for blow-moulding respective containers (2), and with a transfer device (39) for transferring the parisons (3) from a flexible feed conveyor (41) to the respective moulding cavities (19). The transfer device (39) is connected to the flexible feed conveyor (41) at a transfer station (40), where the spacing (Pl) of the parisons (3) is equal to the distance (D2) between the longitudinal axes (19a) of the moulding cavities (19) of one moulding unit (15).
Abstract:
A plant for blow-moulding plastic containers (2) from respective parisons (3) comprises a plurality of moulding units (10), each having a mould (11) for blow-moulding at least one container (2) and at least one stretching rod (14) that moves under the action of a drive device (16) in such a way as to axially deform a respective parison (3); the drive device (16) comprises, for each moulding unit (10) drive motor (17) coupled to the stretching rods (14) of the moulding unit (10) itself.
Abstract:
An apparatus for forming an object (2) from a dose (3) of plastics comprises die means (54) provided with a cavity (53) for receiving said dose (3) and with at least two parts (35) that are reciprocally movable for shaping an undercut portion of said object (2), fluid means for applying a clamping force so as to keep said at least two parts (35) in contact; said fluid means is such as to increase discontinuously said clamping force from an initial force that is applicable when said dose (3) is substantially contained in said cavity (53) to a final force applicable when said at least two parts (35) shape said undercut portion.